package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;


public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {


    //因为SubjectExcelListener不交给spring进行管理，需要自己new，不能注入其他对象
    //不能实现数据库操作
    public EduSubjectService subjectService;
    public SubjectExcelListener() {}
    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }



    //读取excel内容，一行一行读取
    @Override
    public void invoke(SubjectData data, AnalysisContext context) {
        if (data == null){
            throw  new GuliException(20001,"文件数据为空");
        }

        //一行一行读取。而每次读取都有两个值，第一个值是一级分类，第二个值是二级分类
        //添加一级分类
        //判断一级分类是否重复
        EduSubject eduSubject = this.existOneSubject(subjectService,data.getOneSubjectName());
        if (eduSubject == null){
            eduSubject = new EduSubject();
            eduSubject.setParentId("0");
            eduSubject.setTitle(data.getOneSubjectName());
            subjectService.save(eduSubject);
        }
        //添加二级分类
        //判断二级分类是否重复
        String pid = eduSubject.getId(); //获取一级分类的id值
        EduSubject existTwoSubjet = this.existTwoSubject(subjectService, data.getTwoSubjectName(), pid);
        if (existTwoSubjet == null){
            existTwoSubjet = new EduSubject();
            existTwoSubjet.setParentId(pid);
            existTwoSubjet.setTitle(data.getTwoSubjectName());
            subjectService.save(existTwoSubjet);

        }


    }

    //判断一级分类不能重复添加
    private EduSubject existOneSubject(EduSubjectService subjectService,String name){
        //判断表中是否有相同的一级分类
        QueryWrapper<EduSubject> eduQuery = new QueryWrapper<>();
        eduQuery.eq("title",name)
                .eq("parent_id","0");

        EduSubject oneSubject = subjectService.getOne(eduQuery);

        return oneSubject;

    }

    //判断二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService subjectService,String name,String pid){
        //判断表中是否有相同的一级分类
        QueryWrapper<EduSubject> eduQuery = new QueryWrapper<>();
        eduQuery.eq("title",name)
                .eq("parent_id",pid);

        EduSubject twoSubject = subjectService.getOne(eduQuery);

        return twoSubject;


    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {

    }

}
